Improved tackle block



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JOHN BRIGGS, OF LOUISVILLE, KENTUCKY, ASSIGNOR TO HIMSELF AND E. A. HOLMES, OF PASSAIQ, NEW JERSEY. Letters Patent No. 60,614, dated December 18, 1866.

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TO ALL WHOM IT MAY CONCERN: I

Be it known that I, JOHN BRIGGS of Louisville, in the county of Jefferson, and State of Kentucky, have invented a new and improved Tackle Block; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing, forming a part of this specification, in which- Figure 1 is a side view of my invention.

Figure 2 is a transverse vertical section of the same, taken in the line :0 :v, fig. 1.

Similar letters of reference indicate like parts.

This invention consists in a novel construction of the shell of the block, andin'an improvement on the pin of the sheave and hook, as hereinafter fully shown and described, whereby a very cheap and durable tackle block is obtained. v

The following description and drawings refer to a single-sheave snatch block, but the invention is applicable to all kinds of tackle blocks.

The shell or checks A A of the block are of iron. In practice I design to use scrap iron, as being the cheapest and answering every purpose. The lower parts of the cheeksA A have their edgesswaged outward in flaring form, as shown at a, in fig. 2; and between their lower swaged parts the sheave B is fitted. The sheave B is of usual construction. 0 is the sheave pin, which passes transversely through the cheeks A A, has a head, 6, on one end, and a screw-nut, c, on the other end; and D is a collar or bushing placed on the pin 0, the sheave B being fitted loosely on the collar or bushing, and turning freely thereon. The collar or bushing D is rather longer than the width of the sheave, so as to prevent the cheeks A A from binding against it, and a hole, cl, is made through one of the cheeks, .through which oil is admitted to D, the-hole being in line with the periphery of D, to admit of the oil passing between D and the hole in the sheave in which D is ,fitted. By these means the sheave is provided with a large axis, one which will not be liable to eventually give way, as would be the case were the pin 0 used as an axis. E is the 'hook, which is fitted between the upper ends of the cheeks A A on a collar or bushing, F, through which a pin, G, passes, said pin passing through the upper ends of the cheeks. This pin and collar or bushing are arranged precisely the same as those of the sheave B, the collar or bushing F preventing the cheeksA A from binding against the inner end of thehook, and also serving as a large 'bearin g for the latter. The upper ends of the cheeks A A are stayed-by pins, e ejone at each side. These pins protect the cheeks from torsional strain. The swaged edges (1 of the lower parts of the cheeks A A prevent the sheave.

rope being cut or abraded, as would be the case were said edges left angular or sharp. This block may be constructed at a very moderate cost, and so as to be very strong and durable.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is- The combination and arrangement of the sheave pin G, sheave'B, collar D, pin G, bushing F, hook E, pins e e, and checks A A, when all are constructed as herein shown and described.

. JOHN BRIGGS.

Witnesses:

WM. F. McNAMARA, E. A. ELLswon'rn. 

